I may have one or more viruses on my I-phone 6, and an app (I installed mistakenly) called "Ad Control' keeps telling me my phone is at risk for viruses. Can you help me, When can I come in to the Apple Store today/

I would call ahead and make an appointment. You could just show up and see if a tech could help you out . I expect you might have to wait which is why I would suggest making an appointment first!

They prefer customers to have an appointment for service or you can go there and try your luck. What I would do is to make sure my phone is backed up and do a factory reset.